<span>у(5x-y)+4x(x-3y)=5ху-у²+4х²-12ху=4х²-у²-7ху</span>
1) x∈(-∞,∞)
2) IxI-7≠0 x≠7 x≠ -7 x∈(-∞,-7)∪(-7;7)∪(7;∞)
3) <span>x∈(-∞,∞)
</span>4) x≠0
5) x²-16 ≠0 x= -4 x= 4 <span>x∈(-∞,-4)∪(-4;4)∪(4;∞)</span>
F(x)=4x⁵+3x²-
<span>f'решение-во вложении</span>